Abstract
Intercepting and avoiding moving objects requires accurate motion-in-depth (MID) perception. Such motion can be estimated based on both binocular and monocular cues. Because previous studies largely characterized sensitivity to these cues individually, their relative contributions to MID perception remain unclear. Here we measured sensitivity to binocular, monocular, and combined cue MID stimuli using a motion coherence paradigm. We first confirmed prior reports of substantial variability in binocular MID cue sensitivity across the visual field. The stimuli were matched for eccentricity and speed, suggesting that this variability has a neural basis. Second, we determined that monocular MID cue sensitivity also varied considerably across the visual field. A major component of this variability was geometric: An MID stimulus produces the largest motion signals in the eye contralateral to its visual field location. This resulted in better monocular discrimination performance when the contralateral rather than ipsilateral eye was stimulated. Third, we found that monocular cue sensitivity generally exceeded, and was independent of, binocular cue sensitivity. Finally, contralateral monocular cue sensitivity was found to be a strong predictor of combined cue sensitivity. These results reveal distinct factors constraining the contributions of binocular and monocular cues to three-dimensional motion perception.
Highlights
Accurate motion-in-depth (MID) perception is required to intercept and avoid objects
Binocular MID cue sensitivity varies across eccentricity-matched visual field locations
One observer was found to exhibit chance performance for stimuli presented to the left eye at two visual field locations. Another observer exhibited chance performance at a single visual field location for stimuli presented to the right eye at an ipsilateral visual field location. These findings indicate that large variability in MID sensitivity across eccentricity-matched visual field locations and MID processing deficits are not unique to binocular cues, and occur with monocular cues
Summary
Accurate motion-in-depth (MID) perception is required to intercept and avoid objects. The direction of MID (i.e., ‘‘toward’’ vs ‘‘away’’) is conveyed by signals contained within time-varying retinal images. These signals can be broadly divided into binocular cues which require comparisons of information across the two eyes, and monocular cues which include information available to a single eye. Monocular cues to MID are provided by optic flow, as well as changes in the retinal size and density of visual elements (Longuet-Higgins & Prazdny, 1980; Regan & Beverley, 1979).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
